Population and Random Sample

During a middle school baseball ​game, every spectator placed his or her ticket stub into a container. After the​ game, the coach chose eight people to march in the sportsmanship parade. What is the sample in this​ situation?

• The coach

• The ticket stubs

• The eight people to march in the sportsmanship parade

• The baseball game spectators

Identify the population and sample in the following survey:

To determine the number of students who carry backpacks in school, Tina collects data on the first 100 students who enter the building.

Which is the POPULATION

• students

• first 100 students

A survey company was trying to see if people in a state thought the pollution was too high. Which choice BEST represents the population to be surveyed?

• a selection of people who live in small towns

• a selection of people who live in clean neighborhoods

• a selection of people from each city in the state

• all the people in the state

Choose the true statement(s) about the census and sample shown.

• The sample could be considered too small.

• The sample is biased because is does not include everyone.

• The sample is representative of the population's sub-groups.

A city council member wanted to know how her constituents felt about a planned rezoning. She randomly selected 75 names from the city phone directory and conducted a phone survey.

• The population is everyone listed in the city phone directory; the sample is the 75 people selected.

• The population is residents of the city; the sample is the registered voters in the city.

• The population is registered voters in the city; the sample is everyone listed in the city phone directory.

A safety inspector conducts air quality tests on a randomly selected group of 7 classrooms at an elementary school.

• The population is all classrooms in the district; the sample is the 7 classrooms selected.

• The population is all classrooms in the elementary school; the sample is the 7 classrooms selected.

• The population is all elementary students in the school; the sample is the students in the 7 classrooms selected.

I surveyed 100 people at a grocery store by selecting every 3rd person that entered, does this sample represent the local population?

• Yes, it is random and unbiased.

• Yes, it is random and biased.

• No, while it is random, it is also biased.

• No, while it is random, it is also unbiased.

I drew 10 names from a hat containing the names of every student that I teach, what type of sample have I taken?

• A random sample.

• A biased sample.

4. A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.

• Biased

• Unbiased

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy

• thirty students who are rarely tardy

• thirty of her friends

• thirty randomly selected students from her school